/*
 * noisebox.h -- interfaces for noise provision.
 */

#include <fuse.h>
#include <stddef.h>

#include <pcg_variants.h>

#ifndef NOISEBOX_H
#define NOISEBOX_H

typedef struct {
    char *name;
    uint64_t size;
} NoiseFile;

typedef struct {
    char* name;
    void *state;

    int noisefile_count;
    NoiseFile **files;

    int (*get_noise)(size_t, off_t, char*, struct fuse_file_info *);

    // int (*do_readdir)(const char *path, void *buffer, fuse_fill_dir_t filler,
    //         off_t offset, struct fuse_file_info *fi);
    int (*do_open)(const char *, struct fuse_file_info *);
    int (*do_release)(const char *, struct fuse_file_info *);
} Noiser;

typedef union {
    pcg32_random_t *pcg;
} rng_state_t;

// linked list of open file states
struct file_state {
    char *name;
    rng_state_t rng;
    size_t consumed;
    struct file_state *next;
    // assume prng output is some integral number of chars.
    int char_ratio;
};

struct nb_context {
    Noiser **noisers;
    struct file_state *state_head;
};


Noiser* zero_init(void);
Noiser* mersenne_init(void);
Noiser* pcg_init(void);

#endif